Ditto on what DC said. I would also suggest starting with Kurt at 45" Parts Depot after you find out just what you are running right now. He is in the Netherlands at...
http://www.45partsdepot.com/45parts/indexexp.htmlKurt has quite a bit of performance parts for the 45" and he will take the time to chat with you about the upgrade. He also stocks the diaphram clutch conversion. This clutch should make up for the weaker stock clutch when it comes to higher gear ratios and more horsepower. Real nice trike you got there too ! Pa

Great lookin scoot. It takes horsepower to turn and push those wide tires thru the wind. Even tho they look great get a set of narrower wheels and tires, mags, spokes(my preference), even steel discs. 5.00 or 6.50x16s. See how much faster you can go. It really makes a difference, Honest. Keep the wide ones for shows tho, they look great.

DC are you saying these wheels aren't slowing this down. I can see the advantage on the freeway keeping up with traffic at 70+ mph, but you have to get there first. As a matter of fact I probably was sleeping or doing something I shouldn't have been in physics. But I have been building 9 sec. street cars for the last 20+years. When your driving from light to light in town, lighter is better.
And then you have to stop those big flywheels, but we're not there yet.
Activate, don't get me wrong the wheels look great, and there are things you can do to get more out of this trike to make up for the rotating mass, but more power to the wheels will definately need a better than stock clutch.

I definitely agree this set up should handle way better than stock, and wind resistance is not a factor here, and maybe the stock clutch would be enough. But the rotating mass 10X factor is a fact, be it wheels, tires, driveshaft, axles. I know this trike doesn't have a driveshaft, at least, I don't think it does.